Piston packing



' June 1,1926. 1,586,967

CCCCCCCCCCC ER PPPPPPPPPPP NG Patented June l, 1926.

UNITED STATES PATENT OFFICE.

GHARLES S.- CRICKMER, 0F DALLAS, TEXAS, ASSIG-NOR TO THE GUIBERSON CORPORA- TION, 0F DALLAS, TEXAS, A CORPORATION OFVDELAWARE.

PIs/roi: PACKING.

Application filed Apri1 17; '1924. Serial No. 707,277.

This invention relatesy to new and useful improvements in rod packings.

The invention has particularly to do with that type of packings in which a liexible or elastic member is compressed about a. rod sliding therethrough, by means of fluid pressure.

In such packings considerable ditliculty has been experienced in the fluid leaking be' tween the sides of the packing member and the bottom of the stuffing box or 'the gland nut.

The object ofthe invention is to provide a packing in which the fluid is excluded from passing from the box to the rod as wel-l as from passing along the rod.

A further object of the invention is to provide a packing in which the packing member is sealed against the bottom of the box and the gland by means of the fluid pressure.

Another object of the invention is to provide a packing member having reduced elastic sealing edges or lips located to be displaced by the Huid pressure to seal against the Walls of the stuing box.

A construction designedvto carry out. the invention together with other novel features will be hereinafter described.

The invention will be more readily understood from a reading of the'following specitication and by reference to the accoinpanying drawings, in which an example of the invention is shown and Wherein:-

Fig. 1 is a sectional view of a stuffing box and component parts having a packingimem- -ber constructed in accordance with my invention, I

Fig. 2 is a cross-sectional view taken on the line 2 2 of Fig. 1, and

Fig. 3 is a cross-sectional View taken on the line 3-3 of Fig. 1.

In the drawingsthe numeral 10 designates the cap of a cylinder or other parts to which r a stuffing box 11 is attached or cast. The

box -has the usual annular bore 12. The piston rod 13 passes through the center ot' the box and a gland nut 14. The nut 1s fastened by machine screws 15 or otherwise 0 and receives an annular packing ring 1 6.

IVithin thel bore of the box an annular packing' member 17 is fitted Aon the piston rod 13. This member has a peripheral channel or groove 18 with marginal flanges or lips 19. The member is to be made of suitable material whereby the body will be sufficient- The lips 19 are reduced to a very thinV l edgeby curving their inner walls from the channel to their outer edge so as to be read- 1ly acted upon by the fluid pressure from the cylinder which enters through a port 20.

They fluid fills` the channel 18, thus" com-v pressing the packing member, and then tends to spread the lips, whereby they are held against the bottom wall of the box and the luid from passing between the packing member and said wall and said'nutand thus finding its way to the rod 13.

Where the pressure is constant an open port from the cylinder to the box is all that is required, but. where the pressure is intermittent I provide a bore 214 in the box con nesting with the port 20 and having a plug 22 sealing its end and provided with a central aperture. A spring pressed ball valve 23 seats against the inner end of the plug. Upon pressure the valve opens and admits iuid to the stufling box, but upon suction or relief of the pressure, the valve closes, thus holding the pressure in the box.;

The flexible lips 19 are the essential feature of the invention and any means whereby the same results arev accomplished are within the scope of the invention. These lips may extend to the intersections of the annular wall of the box and the bottom and nut. thereof, as isshown, or this structure maybe varied. The lips may be elongated or their shapes changed in many ways.

A packing of the character described comprising a relatively thick cylindrical body having a peripheral channel with marginal inner side of the nut 111. This prevents the I annular lips reduced to very thin 4flexible edges having their inner faces curved from the bottom of the channel to their outer edgesv1 the sides of the .body being fiat and extending in continuous planes vradially t0 the edges of the lips. f

lIn testimony whereof I afiix my signature. v CHARLES S. ,CRICKMER 

